Royce Capital Fund - Micro-Cap Portfolio - Investment Class Ultra Clean Holdings [Member] Ichor Holdings [Member] Graham Corporation [Member] NWPX Infrastructure [Member] Cohu [Member] Lincoln Educational Services Bel Fuse Cl. B [Member] EZCORP Cl. A [Member] Lindblad Expeditions Holdings [Member] Digi International [Member] Healthcare Sector [Member] Financial Services Sector [Member] Energy Sector [Member] Real Estate Sector [Member] Cash and Cash Equivalents [Member] Royce Capital Fund - Micro-Cap Portfolio - Service Class Royce Capital Fund-Small-Cap Portfolio - Investment Class TD SYNNEX [Member] M/I Homes [Member] Blue Bird [Member] Diebold Nixdorf [Member] Timberland Bancorp [Member] Village Super Market Cl. A [Member] IBEX [Member] Interface [Member] PulteGroup [Member] Unity Bancorp [Member] Royce Capital Fund-Small-Cap Portfolio - Service Class Net Assets Investment Company, Portfolio Turnover